Tandem disk harrow



March 12,1929.

Filed S6P 26, 1925 1 r I a w 9 if- I.

a j q 2 Shoots-$119M 1 March 12, 1929. J. TEDELL ,7 ,151

TANDEM nzsx nARRow Filed Sept. 26, 1925 2 Sheets-Sheet 2 Patented Mar. 12, 1929.

UNITE stairs PATE T OFFICE.

JOHN TEDELL, OF SYRINGFIELD, ILLINOIS, AS$IGNOR TO MGNTGOMERY' .VARD 8a (10.,

INC., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

TANDEM DISK nannow- Application filed September 26, 1925. 7 Serial No. 58,730.

The present invention relates to harrows, and is more particularly concerned with disk harrows whereinthe gangs of the disks are arranged in tandem relation.

Its primary object is to improve the construction of these implements by the provision of novel and efiicient means for coupling the sections in tandem relation, and in such manner as to insure the maintenance of alignment of the rear or following section with respect to the front section when the direction of forward travel is in a straight line. 7 r

A further object of the invention is to pro vide coupling means for the harrow, sections having relatively high flexibility, whereby a greater range of movement of the sections with respect to each other is permitted when turning, and by means of which the entire structure of the harrow may change its direction in much smaller space than where the rear section is rigidly secured to' the front section.

The invention further seeks to provide a tandem harrow wherein the parts are so organized andcombined that the draft will be imparted to the sections thereof in a unlform manner, and properly distributed therethrough to the several disks of the gangs.

.Other objects will appear as the nature of the improvements is better understood, the invention consisting substantially in the novel construction, combination and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings, and finally pointed out in the appended claims. l hilo the form of the invention made the basis of the present disclosure is believed to be a preferred embodimentthereof, and illustrates a practical adaptation to the uses and purposes for which the same is intended, its presentation in this form is to be considered merely illustrative, andthe invention,

herefore, is not to be restricted to the form herein shown and described.

In the drawings, Fig. 1 is a top plan View, partially broken companying drawings, it isto be understood that the present invention is not concerned with the general'structural features .of a tandem harrow, and it is needless, therefore, to enter upon a detailed description of such features. Itis suficient to point out that the present invention is capable of embodiment in the usual. construction of tandem disk harrow, modification of which is necessary only to incorporate therein the features of structure which are peculiar to the present invention. Thus, the numerals 10 and 11 designate the supporting frames of the front section of a tandem disk harrow with which are associated the gangs of disks 12and 13, a draft pole 1 1 being suitably connected to the front section to which the power is applied for the propulsion of the harrow.

The numerals 15 and 16 designate the supporting frames of the rear or trailing section, and with these frames are associated'the gangsof disks Hand 18. It is to be observed that the disks 17 and 18 are iii-offset relation with respect to the disks 12 and 13, so that these disks 17 and 18 cut the soil between the lines cut by the disks of the front section.

The usuallevers and link connections for adjustment of the disks to vary the depth of cut and for similar purposes are 2!,lSO1I100r-. porated in the general'harrovv structure, but as these form no part of the presentinvention description of the same is not given.

To connect the rear or trailing section with 0 the front section a pair of parallel draft bars 19 is employed. The rear ends of these bars are turned outwardly and suitably secured to a yoke bar 20 the ends of which are suitably fastened to the supporting frames of the rear c section, said draft bars being braced by rearwardly extending tie rods 21 connected to the members of the rear section, and by other tle rods 22 which are connected to the yoke bar ()0 1 The draft bars 19 also are held in parallel relation, and fixed with respect to each other, by a pair of bolts 23 each of Which is surrounded by a spacing sleeve 24:, one of said bolts serving to anchor the forward ends of the tie rods 22 upon the draft bars 1%).

At a point slightly in advance of the forward bolt e3 the extremities of the draft bars 19 are bent out "ardly so as to be positioned in divergent relation, and these extreniities are tied together by an arched bar 25 which constitutes a foot rest for the operator of the harrow. A seat 26 is provided for such operator, which'seat is mounted upon a supporting stander-d2"? which rises upwardly and rearwardly from the draft pole The divergent forward extremity of each of the draft bars 19 has an elongated slot 28 formed therein, and passing through each of said slots 28 is a connecting bolt 29. Each of these bolts 29 passestln'ough a pair of spaced guide heads 30 projecting upwardly.

from a bracket 31 which is fixedly connected, by suitable means, with a portion of the frame of the front section of the harrow. The inner faces of the heads of each pair are wedge-shaped to provide knife edges 32, and each pair of said heads 30 receives the divergent forward end of one of the draft bars 19. The knife edges 32 constitute hearing points which are adapted to contact with the sides of the divergent ends of the draft bars 19, and due to the positioning of the bolts 29 within said heads and the slots 225 of said bars 19, said bars and said heads are capable of relative movement with respect to each other. Thus, when draft is applied to the pole 14 in a forward direction, the front section of the barrow will move forwardly until the knife edges 32 of the outermost heads 30 engage the outer faces of the bent extremities of the draft bars. 19. Two points of contact with these bentextremities thus are established. and in the continuedforward movement of the front section in a straight line such movement is transmitted through these two points of contact and the draft bars 19to therear section of the barrow. section, therefore, trails the forward section and holds its position directly in alignment with the front section.

It will be observed that the space between the knife edges 32 of the heads of each pair and the bent extremity of the guide bar 19 positioned between such pair is slightly greater than the thickness of the bent end, so a that a limited degree of play between these bent ends ofthe draft bars andthe guide heads 30 may exist at times. This lay is availed of in the turning movement of the barrow, or when it is desired to change the di- This rection of its travel under the application of power to the draft pole 1 1 At such times,

points for the bars 19. After the barrow has been turned accomplish the desired change in its direction of travel, and the front section is again straightened, the rear or trailing section again becomes aligned with the front section, due to the engagement of the outermost guide heads 30 and their knife edges with the sides of the bent extremities of the bars 19, and this alignment of the two sections continues in the further for ard movement under the draft exerted on the pole 14.

From the foregoing it will be apparent that the two points of contact of the outermost guide heads 30 with the draft bars 19' afford two points of tension or pull each of which is at an equidistance from the center of the rrcnt section of the harrow, and also from the point of drag or draft exerted tl'irough the pole 14;,a-nd this causes the trailing section always to take up its position directly in rear of the front section during the advance or forward increment of the latter, and in such movement the two sections are preserved in alignment and the disks of the gangs of the rear section held in proper relation to the disks of the gangs of the front section.

By the provision of the slots 28, the connecting; bolts 29, and t 1e knife edges 32 greater flexibility of turningmovement between the two sections of the harrow is also obtained, so that the structure of the entire harrow may change its direction in much smaller space than would he the'case were the rear section rigidly secured to the front section.

I claim:

1. In a tandem harrow, thecon'ibination with the front and trailing; sections thereof,

of a pair of draft bars connected to the trailing; section, and a pair of guide heads carried by the front section, each guide head coniprisin opposed members between which one of said draft bars is positioned for engagement, said guide heads affording two points of tension equidistantly spaced fromthe line ofdraft of the harrow, whereby to maintain the trailing section in alignment with the front section during the forward movement of the latter in a straight line.

2. In a tandem harrow, the combination lift,

with the front and trailing sections thereof, of a pair of draft bars connected to the trailing section, a pair of guide heads car 'ied by the front section, each guide head comprising opposed members between which one of said draft bars is positioned for engagement, said guide heads affording two points of tension equidistantly spaced from the line of draft of the harrow, whereby to maintain the trail ing section in alignment with the front section during the forward movement of the latter in a straight line, and means for permitting angular movement between said sections for effecting turning of'the harrow.

3. In a tandem harrow, the combination with the front and trailing sections thereof, of a pair of draft bars connected to said trailing section and having their forward extremities extending in divergent relation, and a pair of guide heads associated with the front section and between which said divergent extremities of the draft bars are positioned, said guide heads affording two points of tension equidistantly spaced from the line of draft of the harrow, whereby to maintain the trailing section in alignment with the front section during the forward movement of the latter in a straight line.

4. In a tandem barrow, the combination with the front and trailing sections thereof, of a pair of draft bars connected to said trailing section and having their forward extremities extending in divergent relation, each of said extremities having an elongated v slot, spaced guide heads carried by said front section, said guide heads engaging the ex tremities of said draft bars for relative movement, and means carried by said guide heads and engaging said slots for holding the draft bars in parallel relation to said guide heads.

5. In a tandem harrow, the combination with the front and trailing sect-ions thereof, of a pair of draft bars connected to said trailing section and having their forward extremities extending in divergent relation, each of said cxtremitieshaving an elongated slot, spaced guide heads carried by said front section, said guide heads engaging the ex tremities of said draft bars for relative movement, and a bolt carried by the guide heads of each pair and extending through the slot of the draft bar associated with said pair to hold the. draft bar in associated relation with the guide heads thereof.

6. In a tandem barrow, the combination with the front and trailing sections thereof, of a pair of draft bars conne ted to the trailing section and having their forward extremities extended in divergent relation, a pair of guide heads carried by the front section and associated with the forward extreme ity of each of said draft bars, whereby said extremity is positioned therebetween, the opposing faces of each pair of said heads being provided with knife edges adapted to co-opcrate with the sides of the draft bars to form pivot points upon which the draft bars'may turn in the turning movement of'the harrow sections, and means for holding the draft rods andguide heads in associated relation.

7. In a tandem harrow, the combination with the front and trailing sections thereof, of a pair of parallel draft bars connected to a trailing section, the forward extremity of each of said draft bars beingbent outwardly to position said extremities in divergent relation,

' brackets carried by the front section and each provided with a pair of upwardly extending guide heads arranged in spaced relation and receiving one of the bent extren'iities ofthe draft bars, and means for holding said draft bars in associated relation with the guide heads of said brackets but capable of relative movement with respect thereto.

8. In a tandem harrow, the combination with the front and trailing sections thereof, of a pair of parallel draft bars connected to said trailing section, the forward extremity of each of said bars being bent outwardly to position said extremities in divergent relation, brackets carried by said front section and each provided with a pair of upwardly extending guide heads spaced apart to receive the bent extremities of the draft bars, each of said bent extremities being slotted, and a bolt extending through the slot of each of said-extending guide heads, the inner faces of said guide heads having knife edges adapted for contact with the sides of the associated draft bar to afford plvotal polnts between said guide bars and said brackets in the turning movement of the h arrow, an d means for holding the draft bars in associated relation with said brackets.

10. In a tandem harrow, the combination with the front and trailing sections thereof, of a pair of draft bars connected to said trailing s-ction, the forward extremity of each of said draft bars being bent outwardly to position said extremities in divergent relation, each of said extremities having an elongated slot, brackets carried by the front section and each provided with a pair of upwardly extending spaced guide heads between which the forward extremity of one of the draft bars is positioned, and a bolt extending and positioned in the guide heads of the associated bracket; whereby said draft bars are connected to, said brackets but capable of rel ative movement therebetween. I 5 i 11. In a tandem barrow comprising front and trailing sections connection means between said sections comprising draft bars attaehed to the trailing section arranged in diverging relationship at their forward ends,

and pairs of mist-ending. guide members attached to the front section on opposite sides of the center line of draft, the draft ha rs being mounted respectively between the menibers of each pair of guides.

In testimony whereof I have hereunto signed my name.

JOHN TEDELL; 

